using System;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using Gadgeteer.Modules;

/*
 * Original Gadgeteer framework Copyright (c) Microsoft Corporation. (http://gadgeteer.codeplex.com/)
 * 
 * Gadgeteer Light made by Stefan Thoolen (http://gadgeteerlight.codeplex.com/)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
namespace Gadgeteer.Interfaces
{
    /// <summary>Wrapper for a digital tristate port</summary>
    public class DigitalIO
    {
        /// <summary>The actual tristate port</summary>
        private TristatePort _port = null;

        /// <summary>Creates a new digital tristate port</summary>
        /// <param name="socket">The socket on which the port exists</param>
        /// <param name="pin">The pin #</param>
        /// <param name="initialState">The initial state</param>
        /// <param name="glitchFilterMode">Should we use the glitch filter</param>
        /// <param name="resistorMode">Should we use a pull resistor</param>
        /// <param name="module">The module driving this pin</param>
        public DigitalIO(Socket socket, Socket.Pin pin, bool initialState, GlitchFilterMode glitchFilterMode, ResistorMode resistorMode, Module module)
        {
            _port = new TristatePort(socket.CpuPins[(int)pin], initialState, glitchFilterMode == GlitchFilterMode.On, (Port.ResistorMode)resistorMode);
            this.IOMode = IOModes.Input;
        }

        /// <summary>Available I/O modes</summary>
        public enum IOModes
        {
            Input,
            Output
        }
        
        /// <summary>Sets or gets the current I/O mode</summary>
        public IOModes IOMode
        {
            get
            {
                if (this._port.Active) return IOModes.Output;
                return IOModes.Input;
            }
            set
            {
                if (value == IOModes.Input && this._port.Active == true) this._port.Active = false;
                else if (value == IOModes.Output && this._port.Active == false) this._port.Active = true;
            }
        }

        /// <summary>Sets the ports state</summary>
        /// <param name="state">True for high, false for low</param>
        public void Write(bool state)
        {
            this.IOMode = IOModes.Output;
            this._port.Write(state);
        }

        /// <summary>Reads the ports state</summary>
        /// <returns>True for high, false for low</returns>
        public bool Read()
        {
            this.IOMode = IOModes.Input;
            return this._port.Read();
        }
    }
}
